/usr/lib/python2.7/dist-packages/Codeville/agent.py is in codeville 0.8.0-2.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# see LICENSE.txt for license information
from bencode import bdecode, bencode
from crypt import crypt
from errno import EINTR
import os
try:
import select
except ImportError:
import selectpoll as select
import hashlib
import socket
import SRP
from cStringIO import StringIO
import struct
AUTH_UNUSED = 0
AUTH_SOCK = 1
AUTH_CONNECTION = 2
class Agent:
def __init__(self):
self.auth_path = None
self.auth_file = None
self.poll_obj = select.poll()
self.hstatus = {}
self.identities = {}
self.allow_shutdown = 0
return
def listen_sock(self, auth_path, auth_file):
if self.auth_file is not None:
print 'Auth socket already set'
return None
self.auth_path = auth_path
self.auth_file = auth_file
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
sock.bind(auth_file)
sock.listen(8)
self._new_socket(AUTH_SOCK, sock)
return sock
def listen(self):
if self.auth_file is None:
print 'No socket to listen on'
return 1
self.shutdown_flag = 0
while not self.shutdown_flag:
try:
sock_list = self.poll_obj.poll()
except select.error, reason:
if reason[0] != EINTR:
raise
else:
self._after_poll(sock_list)
self.cleanup()
return 0
def cleanup(self):
for fd, status in self.hstatus.items():
del self.hstatus[fd]
self.poll_obj.unregister(fd)
status['sock'].close()
os.unlink(self.auth_file)
if self.auth_path is not None:
auth_path = self.auth_path
self.auth_path = None
os.rmdir(auth_path)
return
def _process_message(self, sock):
status = self.hstatus[sock.fileno()]
input = status['input']
input.seek(status['in_offset'])
data = input.read(4)
if len(data) != 4:
return
msg_len, = struct.unpack('<i', data)
if msg_len <= 0 or msg_len > 1024:
self._write_error(sock, 'Bad message lenth')
self._close_socket(sock)
return
data = input.read(msg_len)
if len(data) < msg_len:
return
status['in_offset'] += 4 + msg_len
try:
msg = bdecode(data)
except ValueError:
self._write_error(sock, 'Bad message')
self._close_socket(sock)
return
type = msg['type']
if type == 'CDV_AGENT_ADD_PASSWORD':
id = hashlib.sha1('password' + msg['password']).digest()
self.identities[id] = msg['password']
self._write_answer(sock, bencode({'id': id}))
elif type == 'CDV_AGENT_ADD_SECRET':
id = hashlib.sha1('public hash check' + msg['secret']).digest()
self.identities[id] = msg['secret']
self._write_answer(sock, bencode({'id': id}))
elif type == 'CDV_AGENT_ADD_ENCRYPTED_SECRET':
if not self.identities.has_key(msg['id']):
self._write_error(sock, 'No such identity')
return
secret = crypt(msg['secret'], self.identities[msg['id']])[0]
id = hashlib.sha1('public hash check' + secret).digest()
if id != msg['secret_id']:
self._write_error(sock, 'id does not match')
return
self.identities[id] = secret
self._write_answer(sock, bencode({}))
elif type == 'CDV_AGENT_QUERY_IDENTITY':
known = 0
if self.identities.has_key(msg['id']):
known = 1
self._write_answer(sock, bencode({'known': known}))
elif type == 'CDV_AGENT_SRP_PRIVATE_KEY':
x = SRP.private_key(msg['user'], msg['s'], self.identities[msg['id']])
self._write_answer(sock, bencode({'x': x}))
elif type == 'CDV_AGENT_SESSION_KEY':
if not self.identities.has_key(msg['id']):
self._write_error(sock, 'No such identity')
return
if len(msg['salt1']) < 20 or len(msg['salt2']) < 20:
self._write_error(sock, 'Bad salts')
return
if msg['salt1'] == msg['salt2']:
self._write_error(sock, 'Bad salts')
return
base = 'session key' + self.identities[msg['id']] + \
msg['salt1'] + msg['salt2']
key = hashlib.sha1(base).digest()
answer = {'key': key}
self._write_answer(sock, bencode(answer))
elif type == 'CDV_AGENT_SHUTDOWN' and self.allow_shutdown:
self.shutdown_flag = 1
else:
self._write_error(sock, 'Unknown command: ' + type)
return
def _after_poll(self, sock_list):
for fd, event in sock_list:
status = self.hstatus[fd]
sock = status['sock']
if status['type'] == AUTH_UNUSED:
return
elif status['type'] == AUTH_SOCK:
tries = 3
while tries:
try:
nsock = sock.accept()
except socket.error, reason:
if reason[0] != EINTR:
raise
tries -= 1
else:
break
if tries == 0:
raise
# XXX: python doesn't support SO_PEERCRED
#sock.getsockopt(socket.SOL_SOCKET, socket.SO_PEERCRED)
self._new_socket(AUTH_CONNECTION, nsock[0])
elif status['type'] == AUTH_CONNECTION:
if event & select.POLLHUP:
self._close_socket(sock)
return
if event & select.POLLIN:
data = sock.recv(1024)
if len(data) == 0:
self._close_socket(sock)
return
status['input'].seek(0, 2)
status['input'].write(data)
self._process_message(sock)
if event & select.POLLOUT:
self._flush_socket(sock)
return
def _new_socket(self, type, sock):
sock.setblocking(0)
self.hstatus[sock.fileno()] = {'type': type,
'input': StringIO(),
'output': StringIO(),
'in_offset': 0,
'out_offset': 0,
'sock': sock}
flags = select.POLLIN
if type != AUTH_SOCK:
flags |= select.POLLHUP
self.poll_obj.register(sock, flags)
return
def _close_socket(self, sock):
fileno = sock.fileno()
self.poll_obj.unregister(fileno)
del self.hstatus[fileno]
sock.close()
return
def _write_answer(self, sock, data):
data = struct.pack('<i', len(data)) + data
status = self.hstatus[sock.fileno()]
status['output'].seek(0, 2)
written = 0
if status['out_offset'] == status['output'].tell():
written = sock.send(data)
if written != len(data):
status['output'].write(data[written:])
self.poll_obj.register(sock.fileno(),
select.POLLIN|select.POLLOUT|select.POLLHUP)
return
def _write_error(self, sock, msg):
self._write_answer(sock, bencode({'error': msg}))
return
def _flush_socket(self, sock):
status = self.hstatus[sock.fileno()]
status['output'].seek(status['out_offset'])
data = status['output'].read(1024)
while len(data):
written = sock.send(data)
status['out_offset'] += written
if written < len(data):
break
data = status['output'].read(1024)
if len(data) == 0:
self.poll_obj.register(sock.fileno(), select.POLLIN|select.POLLHUP)
return
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